Bonaventure — on Rev 3:7 (Collations on the Hexaemeron, Collation 3)

“This is the Key of David which the Inspired Word is teaching, this Word, who is uncreated in the bosom of the Father, incarnate in the Virgin's womb, inspired in your heart by faith. He penetrates angelic and human minds, and coming into them, He makes them understand these visions, because He is pure understanding and spirit; but He does so in different degrees, for there are different depths in the penetration by which the soul is intimately led to Him.”